Making it better

From an educational point of view this is a great beginning. What is missing are the cues to help children know where to start and what direction they need to go. If you want to work on developing motor patterns (this is what printing and writing are) it is important to give the right cues from the start. For example the letter C, a green dot at the top of the letter to indicate where to put the finger to start and a small arrow to indicate what direction to move the finger. If you dont give visual cues they may start anywhere in the letter or go from the bottom of the letter to the top. If you included these it truly would be a great app I would recommend as an educator.

Teacher Hat about Letter Tracer preschool letters writing practice, v2.0.1